Opera VPN DNS routing and logging policy limits

Goal

Determine whether Opera's built-in VPN can be configured to route DNS queries through the encrypted tunnel and clarify what usage data, if any, is retained despite the no-logs claim.

Constraints and uncertainty

Opera's documentation states the VPN encrypts HTTP/HTTPS traffic but does not mention DNS handling. The privacy policy asserts no browsing logs are stored, yet it omits details on usage analytics collection. Per-site VPN toggling exists but offers no DNS or IPv6 controls. These gaps make it impossible to confirm if DNS leaks are unavoidable or if logging occurs without independent verification.

Questions

1. Is there a supported method to force all DNS queries through the VPN tunnel on desktop or mobile?
2. What specific usage analytics, if any, are collected when the free VPN tier is active?
3. Can the per-site exemption list be extended to cover DNS or IPv6 traffic?